To do this download the certificate and then go to the Options menu, switch to the Under the Hood tab, find the "Manage certificates" button and press it.

To install the certificate press the "Import..." button.

In the window which appears press the "Next >" button.

To select the file, press the "Browse..." button.

Find on the hard disk the saved certificate file and press the "Open" button.

Then press the "Next >" button.

Keep in mind that the certificate store opened by default may not coincide with the location where you need to install the root certificate.

That is why you have to select the "Automatically select the certificate store based on the type of certificate" option button and press the "Next >" button.

Then you need to confirm the finish of wizard work by pressing the "Finish" button.

Then the "Yes" button.

And finally the "OK" button.

To check the correctness of your actions, go to the Certificates window, switch to the Trusted Root Certification Authorities tab and find the root certificate you have just installed in the end of the list.

Open the Certificate Information window by pressing the "View" button. Verify that the certificate is valid and its validity period ends 03/10/2035